Combined threaded fastener and anchor nut



ly $1945 I c. B. BREEDLOVE 2,403,496

COMBINED THREADED FASTENER AND ANCHOR NUT Filed Nov. 17, 1943 I 3 enter 09 4/5255 5. 5/76225; 0V6.

(Ittomeg Patented July 9, 1946 CUMBIN'EB THREADEDFASTENER' AND" ANCHOR Charlesrfie Breedlova, Detroit, Mich; Application November 17, 1943-; Serial No; 514L626 (Cl-.j 8.5--3:2)

2 -Claims., 1;

The present: invention relates: to: improvements in sel'f locking threaded fasteners; and more particularly, to threadedfast'enersof the: anchor nut type.

The primaryobject: of this invention. is to provide a threaded fastener of the. abovement-ioned typewhichis 'economi'cal to manuf 'acture, easy to assemble and which will securelyfast'err various members together.

Another object-of the invention is to provide a threaded fastener of the anchor nut type in which the var'iou-s-partswill'beheld in assembled relation and compact form and which will lend itself readily to universal use invarious applications;

Another'ob'ject of the" invention is to provide a threadediastenerof the self-locking anchor nut type inoluding a polygona'hshaped shell member having anchoring wing extensions arranged on opposite sides of the shell member to facilitate the attachment of the anchor nut toa support and to provide other-wing extensions on the shell member which are bent inwardly to form nut retaining members as well as lock washers.

Another object of the invention is to provide'a threaded fastener of the self-locking; anchoring nut type in which a friction washer isretain'ed' in position adjacent the top of the threadediastener by aconventional nut snugly fitted within the shell member and said nut is held against removal by means of" a' wing extension bent therebeneath so as to form another washer for engaging thesurf a'ce of a' support or pieceof work";

Another object ofth'e invention is to provide a threaded fastener of the above-mentioned type in which the friction washer' is adapted to; be slightly expanded when the threaded fastener is tightened in place on abolt so-that said expansion will cause the bolt to be tightly gripped and held against accidental displacement.

Another object" of'the invention is-to Provide a threaded fastener of the seHqocki-ng anchor nut type in which the shelI member is formed with angularl ydisposed wall portions" adapted to form a" cavity of" polygonal shape which will mate with the flats of the nutand 'to provide the angul'a-rly'd'isposed wall" portions with wing extensions so bent and shaped as to provide a washer 'beneaththe nutwhich performs a two'- fold' purposesuch asa' lock washer and a retaining'member for the nut to hold the nut from being dislodged before a'bo'lt is applied to the threaded fastener.

Other objectsand advantages of the invention 2; will become apparent during the course: oi the following description of the accompanyingdrawing, wherein:

Figure 1' is a cross-sectional view of a; preferred embodiment of. the invention, illustrating. a selfi-locking threa-ded fastener havinga single wing extension tor retaining the nut in placev and: forming a lock washer for the threaded fastener:

FigureZ is' a top p'lanviewof the self-locking. threaded fastener showing the wing extension prior to: the bending thereof into position as shown: in Figure 1;

Figure 3; is across-sectional: viewof a modified form of the invention illustrating alself-loclring threaded fastener having a pair of oppositely disposed wing extensions to form combined: look i washers and nut retaining: members;

Figure 4--isza top plan view: of the modification shown in: Figure illustrating. the combined nut retaining memherS-andt lock washers. in their extended position: and

Figure 51 is'a toprplan view of a further modified 'iorm of the invention, illustrating a: plur ality'oi wing extensions formed oni-the shell with alternate opposite wings being adapted to be bent-inwardly to form combined lock'washers and nut retaining members with the intermediate wing extensions: forming; anchor strips for attachment toe a suitablesupport.

In. the drawing, wherein: for the purpose of illustrating the invention attention is first directe'di to Figures 1;. and 2 there is shown a preferred embodiment of the self-locking: nut having: a single combined lockwasher and nut retai m-ir;-

Generally; the threaded fastener comprises a shell member 5 a washer 6 an'd'a nut 1 arranged in a. unique and novel manner to provide a threaded fasten'er'which willifrictionally grip the threads of the beltupon which it is placed and to provide a second lock washer to increasethe frictional resistance" against removal of the fastener.

The shell member dis-of polygonali shape: and

is stamped to: provide relatively straightnwall particles 85 angularly connected to provide a polygonal-shaped recess it The'end's of'the shell Ei are open and the upper end isrfla'nged as at I'D to provide an "inwardly" extending bead-ed portion terminating ina downwardly rolled free edge H. The inwardly extending flange tfi' is. adapted to forma seat for aa threadi-gripping Washer 1 2 fitted'withinnme shell? 5 inv the-cavity 9 thereof.

The :nut '1' i's off a general shape and contour to be received in the polygonal recess 1 of the shell member so that the flats of said nut will frictionally engage the straight wall portions 8 of the shell 5 and be thus held in position therein. It is intended to form the shell 5 of such dimenslons as to provide a snug fit between the straight wall portions 8 of the shell and the nut. Also, the nut may be formed of a relatively lightweight metal suchas aluminum or alloys thereof.

Formed integral with one of the straight wall portions 8 of the shell 5 is a wing extension or tab I3 having a diameter equal to the smaller diameter of the shell 5. A bolt-receiving opening 14 is formed in the wing extension I3 and the outer edge of said wing extension is rounded to conform to the shape and general contour of the threaded fastener. As shown in Figure 2, the wing extension or tab I3 is adapted to be folded along the line l5 so as to be bent beneath the nut 1 as shown clearly in Figure 1, after the nut has been fitted intocthe shell 5 so that its top edge engages and firmly presses against the washer 6.

The nut I is provided with a threaded opening I6 lightly smaller in diameter than the opening I4 in the washer extension or tab I3 and said threaded opening 16 is formed slightly greate er in diameter than the opening I! in the washer 6. The washer tab l3 will aid in preventing rotation of the threaded fastener relative to a support or piece of work while the washer 6 will have threads impressed therein by a bolt passing through the opening or bore I! so that said impressed threads will frictionally grip the threads of the bolt and further assist in preventing rotation of said nut on the bolt.

. In addition to forming a lock washer, the washer tab [3 overlies the open end of the shell 5 and is presented against the lower wall of the nut 5 so as to prevent accidental separation of the shell and nut when the threaded fastener is uncoupled from a bolt or the like.

Attention now is directed to Figures 3 and 4 wherein the structure shown is similar to that described in connection with Figures 1 and 2 except that there are two lock washer wing extensions I9 and shown as being formed integral with diametrically opposed straight wall portions 8 of the polygonal shell 5. As in Figures 1 and 2, the wing extensions l9 and 20 are provided with bolt-receiving openings 2| and 22 of substantially the same proportion as the boltreceiving opening 14 and said wing extensions l9 and 20 are adapted to be bent and folded beneath the nut l on the fold lines 23 and 24 respectively so as to underlie the nut and prevent separation of the parts of the threaded fastener. As shown in Figure 3, the wing extension washers l9 and 20 are bentand' folded so that their openings 2| and 22- are in registry and alignment so as to permit the passage of a bolt or the like therethrough.

The wing extension washers are in engagement with the under surface of the nut 1 so as to be positioned between the work and said nut. When the threaded fastener is uncoupled from a bolt, the washer extension wings engage the bottom surface of the nut and retain the same within the polygonal cavity 9 and prevent separation of the nut and self-locking washer 6 from their respective positions in the polygonal shell 5.

In the further modified form of the invention shown in Figure 5, the shell 5, washer 6 and nut I are identical in formation and arrangement to the shell shown in Figures 3 and 4 except that another diametrically opposed pair 5, the assembled threaded fastener provides an anchor nut of the self-locking type which can be constructed from relatively thin gauge metal and which may be anchored in place in positions not readily accessible with fasteners of ordinary construction.

In all of the embodiments of the invention, the lock washer wing extensions retain the nut 1 in place and urge the same into engagement with the washer B which may be formed of a relatively soft material or metalso as to force the washer into tight engagement with the free edge ll of the inturned flange [0.

It is to be understood that the forms of the inventions herewith shown and described are to be taken as preferredembodiments of the same and that. various changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

What I claim is:

l. A threaded fastener comprising a shell member having a polygonal cavity, an inwardly extending continuous annular flange at one end of said shell member, a shelf-locking thread-gripping washer mounted in said shell seated against said ange, a nut snugly fitted in said cavity, combined lockwasher and. nut-retaining wing extensions formed integral with said shell member and projecting from diametrically opposite walls thereof adapted to underlie said nut with their bolt-receiving openings in registry and arranged in overlapping relation whereby to receive a bolt and prevent separation of said shell and nut when the fastener is assembled on a bolt member, and other wing extensions formed on said shell member projecting from opposite sides thereof to provide anchor lugmembers, said shell member being of a size equal to the over all size of the nut and washer to confine and house said nut and washer and to retain the bores of the nut and washer in axial alignment.

2. A threaded fastener comprising a shell member having a polygonal cavity, an inwardly extending continuous annular flange at one end of said shell member, a self-locking thread-gripping washer mounted in said shell seated against said flange, a nut snugly fitted in said cavity, combined lock washer and nut-retaining wing extensions formed integral with said shell member and projectingfrom diametrically opposite walls thereof adapted to underlie said nut with their bolt-receiving openings in registry and arranged in overlapping relation whereby to re- 

